As the next version of C# gets closer, features that are not quite ready have to be cut. The features. Newly removed from the list are primary constructors and declaration expressions. Mads Torgersen writes,

As you’ve maybe heard me say before, language features are a secondary consideration in this release. The primary goal is to deliver a magnificent first release of the Roslyn value proposition: deep language understanding in the IDE and available to everyone through a robust and comprehensive API. To deliver this well, we need to scale back our appetite for language features a bit.

It’s not all bad news. A feature not previously discussed by Microsoft, string interpolation, is expected to make it in. String interpolation allows one to inline variables in strings without the need to explicitly call String.Format. String interpolation was added to the Mono compiler back in 2009 as an experimental feature.

Features that are expected to be included in the next version include:

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